W2 REDOX REACTION

What does the term 'redox' combine?

• Reduction and reaction

• Oxidation and reduction reaction

• Reduction and oxidation

• Oxidation and reaction

What happens to the oxidation number during a redox reaction?

• It remains the same

• It changes for specific elements

• It decreases for all elements

• It increases for all elements

In a redox reaction, what does oxidation involve?

• Gaining electrons

• Losing electrons

• Combining with oxygen

• No change in electrons

What is the oxidation number of an atom in its free state?

• Can be positive, negative, or zero

• Always zero

• Always negative

• Always positive

What is an oxidizing agent?

• A substance that receives electrons

• A substance that donates electrons

• A substance that has a negative charge

• A substance that has a positive charge

What is a reducing agent?

• A substance that donates electrons

• A substance that has a positive charge

• A substance that has a negative charge

• A substance that receives electrons

What is the result of combining oxidation and reduction equations?

• Balanced equation

• Chemical equation

• Molecular equation

• Ionic equation

Which of the following is an example of oxidation?

• Mg → Mg2+ + 2e-

• Fe2+ → Fe3+ + e-

• I2 + 2e- → 2I-

• Sn4+ + 2e- → Sn2+

Which of the following represents a reduction reaction?

• Fe2+ → Fe3+ + e-

• I2 + 2e- → 2I-

• Mg → Mg2+ + 2e-

• Sn4+ + 2e- → Sn2+

What is the main characteristic of a redox reaction?

• Only oxidation occurs

• Only reduction occurs

• Both oxidation and reduction occur

• No change in oxidation states